This happened to my 2013 and the louvers needed to be replaced with a "louver retrofit". Apparently there has been a redesign. My louvers also did not open during supercharging and and I received an alert regarding reduced cooling performance while the car was supercharging. In other words, it could not cool the cabin and the battery at the same time so cabin cooling was compromised. I called Tesla service, they saw the error immediately when they pulled up my VIN on their computer, and scheduled me for an emergency louver replacement at a service center closest to my destination. Amazing service!